Joint for mechanical elements



(No Model.)

G. S. HEATH. JOINT FOR MECHANICAL ELEMENTS.

No. 445,401. Patented Jan. 27, 1891.

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GEORGE S. HEATH, OF SPRINGFIELD, MASSACHUSETTS.

JOINT FOR MECHANICAL ELEMENTS.

SPECIFICATION forming part of Letters Patent No. 445,401, dated January 27, 1891.

Application filed June 11, 1890. Serial No.355,003. (N model.)

To all whom Ill; 17mg, concern:

Be it known that I, GEORGE HEATH, a ci tizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Joints for Mechanical Element s of which the following is a specification.

This invention relates to the formation of parts to be jointed, the objects thereof being to adapt the said parts to be readily connected and disconnected the one from the other, and to insure the most close and perfect bearing between the parts, whereby lash or play is avoided.

A still further object of the invention is to insure the formation of the parts to be jointed at a minimum expense.

A situation in which the invention is particularly applicable is at the place of and for the pivotal connection between one of the push-down or key rods of a type-writing machine and one of the type-bar-actuating levers thereof.

The invention consists in the formation of parts whereby they are adapted to be engaged the one with the other and to have the one upon the other a swinging movement, as if pivoted thereon, all substantially as hereinafter described,and set forth in the claims.

Reference is to be had to the accompanying drawings, in which an illustration of the pres ent improved joint is given.

Figure 1 is a perspective View of a fulcrumed lever and a push-down bar or red, said mem, bers being engaged the one'with the other for substantially a pivotal connection due to their novel formation. Figs. 2 and 3 are side views of the extremities of levers and central vertical sections of the push-down rods in engagement therewith, the said parts being shown intheir respective relations when forced or swung in diiferent directions. Fig. l is a View to illustrate the manner of connecting or detaching the parts.

While in the illustrations presented the two parts formed to be jointed according to this invention consist of a lever A and a pushdown rod or draftbar B, it will be plain that the joint is adapted for application where substantially a pivotal connection is desired between two mechanical elements; and with particular reference to the drawings the part A near its extremity is provided with two opposing arms a and h, each of an arc form, the borders of which are described from a common center, there being a space between the said arms a I), and the ends of said arms being disposed at different points with respect to the length of the part A. The arm a is therefore provided with concentric bearing-surfaces 1 and 2, and the arm Z2 is provided with bearing'surfaces 3 and r, concentric with each other and with said bearingsurfaces 1 and The arc-shaped bearingsurface 2 is continued in a returned arc line or course 5, which is radially outside of or beyond and parallel with the bearing-surfaces 2 of arm a. The part B to be connected with the so-formed part A is provided with two apertures at different points in its length, whereby the upper and lower walls or borders of the one aperture form bearing-surfaces 10 and for the are borders 1 and 2 of the arm a, while the upper and lower walls or borders of the other aperture form surfaces and to contact with the arc borders of the arm I). The said apertures in the part B are so spaced that they correspond to the distance between and may embrace the arms a b, and the end walls of said apertures are separated, corresponding to the widths of the said arms which are entered through them. The extremity of the part B is also ext-ended beyond the aperture, embracing arm a just such a distance as to insure the contact of its extremity upon the course 5. It will he therefore seen that in the joint described and shown there are live points of contact between the part A and the part B at all times, and at whatever point within its limit of swing the one part may assume with relation to the other, and the wear between the parts is distributed between the five bearing-surfaces of each element A and 13.

With particular reference to Fig. at it will be noted that the extremities 7 7 of the arms a and h are coincident with longitudinal lines assumed to be drawn on the part A, which are separated by a distance equal to or slightly greaterthan the thickn ess of the partli3,and the said extremities 7 7 have a separation from each other longitudinally of the part A equal to the separation between the apertures 8 Sin the part B. The space 9 between the arms a and Z) of course extends for the purpose of enabling; the connection of the part 13 with the part- A to be readily made to the end of the part A. Therefore on sliding thebar B endwise into the opening 9 until the apertures S therein are opposite the arm extremities, on then swinging said bar 13 in a plane coincident with that of the part A the aperture borders of the bar may be made to embrace and to bear upon the concentric edges of the arc-formed arms.

Having thus described the nature of m y invention and the embodiment thereof, What I claim, and desire to secure by Letters Patent, 1s

1. A part provided with a hearing, as 1, and a member I), the opposite borders 3 and 4 of which comprise arcs which are concentric With said bearing 1, combined with a part having a surface 10 to rest on said bearing 1 and having at a suitable distance therefrom a perforation, through which said member 1) is passed, and on the opposite borders of which perforation the said borders 3 and 4 of said member b bear, for the purpose set forth.

bearing-s11 rfaces of said first-named part, substantially as described.

3. A part provided with two opposing and separated bearing-arms a and I), each of arc form, the borders of which are described from substantially a common center, and the space between said arms being extended to the extremity of said part, combined with another element provided with an aperture having, bearings and to contact with the horders of said arm I), and also provided with a bearing-surface, as 10, to contact with a border of said arm a, all whereby the said parts may be connected to form, in substance, a pivotal joint, and also readily detached, substantially as described.

GEORGE S. HEATH.

Witnesses:

H. A. CHAPIN, WM. S. BELLoWs 

